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sensors Mode-S transponder

A2DB21

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N283WN · BOEING 737-700 · operated by SOUTHWEST AIRLINES CO

Hex
A2DB21
Octal
50555441
Decimal
10,672,929
Country
US
Tail
N283WN
Type
B737
No current signal · last broadcast Jul 26, 21:30 UTC
Flights observed
790
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:30 UTC

Last known position

Most recent position reported by Mode-S A2DB21.

Country allocation

The ICAO 24-bit address A2DB21 falls within the block assigned to United States (US) by ICAO Annex 10, Volume III. Every aircraft registered in United States receives a permanent address from this block at the time of registration; the address stays with the airframe even if the aircraft is re-registered to a different operator within the country.

Callsign history 20 distinct

Callsign Airline Flights Last seen
SWA2407 - 7 2026-07-02
SWA3123 Southwest Airlines 6 2026-05-17
SWA1982 Southwest Airlines 6 2026-05-16
SWA556 Southwest Airlines 5 2026-04-14
SWA4228 Southwest Airlines 5 2026-05-27
SWA3630 Southwest Airlines 5 2026-05-13
SWA284 - 5 2026-07-14
SWA2384 - 5 2026-06-18
SWA2310 - 5 2026-07-17
SWA598 Southwest Airlines 4 2026-04-18
SWA4402 Southwest Airlines 4 2026-05-08
SWA431 - 4 2026-07-18
SWA375 - 4 2026-06-20
SWA2762 Southwest Airlines 4 2026-05-08
SWA2677 - 4 2026-07-18
SWA1433 Southwest Airlines 4 2026-04-25
SWA1383 Southwest Airlines 4 2026-04-17
SWA137 Southwest Airlines 4 2026-05-22
SWA996 Southwest Airlines 3 2026-05-20
SWA994 Southwest Airlines 3 2026-05-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SWA2156 PHL → MDW Jul 26, 20:10 UTCJul 26, 21:25 UTC1h 15m
2026-07-26 SWA541 SJC → OGG Jul 26, 18:00 UTCJul 26, 19:00 UTC1h 0m
2026-07-26 SWA1730 ORD → DAL Jul 26, 15:40 UTCJul 26, 16:45 UTC1h 5m
2026-07-26 SWA1730 ORD → DAL Jul 26, 13:40 UTCJul 26, 14:45 UTC1h 5m
2026-07-26 SWA2266 SJC → SAN Jul 26, 03:15 UTCJul 26, 05:40 UTC2h 25m
2026-07-26 SWA2266 SJC → SAN Jul 26, 03:15 UTCJul 26, 05:36 UTC2h 21m
2026-07-26 SWA3682 MSY → MIA Jul 26, 01:05 UTCJul 26, 02:10 UTC1h 5m
2026-07-26 SWA3682 MSY → MIA Jul 26, 01:05 UTCJul 26, 02:06 UTC1h 1m
2026-07-25 SWA2022 DEN → OAK Jul 25, 22:07 UTCJul 26, 00:08 UTC2h 1m
2026-07-25 SWA2022 DEN → OAK Jul 25, 22:10 UTCJul 26, 00:10 UTC2h 0m
2026-07-25 SWA2226 PHX → SJC Jul 25, 19:30 UTCJul 25, 20:55 UTC1h 25m
2026-07-25 SWA1097 BUR → SFO Jul 25, 16:50 UTCJul 25, 17:40 UTC50m
2026-07-25 SWA519 STL → LGA Jul 25, 14:50 UTCJul 25, 15:45 UTC55m
2026-07-25 SWA3580 BWI → MHT Jul 25, 12:30 UTCJul 25, 13:15 UTC45m
2026-07-25 SWA407 BOS → STL Jul 25, 06:05 UTCJul 25, 06:45 UTC40m
2026-07-25 SWA548 DEN → AUS Jul 25, 01:45 UTCJul 25, 04:15 UTC2h 30m
2026-07-25 SWA548 DEN → AUS Jul 25, 01:40 UTCJul 25, 05:01 UTC3h 21m
2026-07-24 SWA4108 RSW → STL Jul 24, 23:05 UTCJul 25, 00:13 UTC1h 8m
2026-07-24 SWA4108 RSW → STL Jul 24, 20:55 UTCJul 24, 22:15 UTC1h 20m
2026-07-24 SWA4868 MCI → FLL Jul 24, 16:50 UTCJul 24, 19:40 UTC2h 50m
2026-07-24 SWA4868 MCI → FLL Jul 24, 16:47 UTCJul 24, 19:41 UTC2h 54m
2026-07-24 SWA4391 ATL → LGA Jul 24, 13:00 UTCJul 24, 15:45 UTC2h 45m
2026-07-22 SWA4418 SAN → OAK Jul 22, 23:55 UTCJul 23, 02:35 UTC2h 40m
2026-07-22 SWA4418 SAN → OAK Jul 22, 23:53 UTCJul 23, 02:31 UTC2h 39m
2026-07-22 SWA852 LAS → SJC Jul 22, 19:55 UTCJul 22, 22:00 UTC2h 5m
2026-07-22 SWA650 BWI → AUS Jul 22, 17:15 UTCJul 22, 18:50 UTC1h 35m
2026-07-22 SWA650 BWI → AUS Jul 22, 15:40 UTCJul 22, 16:25 UTC45m
2026-07-22 SWA4638 SJC → LAX Jul 22, 12:40 UTCJul 22, 14:35 UTC1h 55m
2026-07-22 SWA4638 SJC → LAX Jul 22, 12:35 UTCJul 22, 14:30 UTC1h 55m
2026-07-21 SWA4938 - Jul 21, 17:05 UTCJul 21, 18:15 UTC1h 10m
2026-07-21 SWA4938 STL → FLL Jul 21, 17:02 UTCJul 21, 19:35 UTC2h 33m
2026-07-21 SWA1751 DEN → STL Jul 21, 14:25 UTCJul 21, 16:10 UTC1h 45m
2026-07-21 SWA1305 ATL → MKE Jul 21, 03:25 UTCJul 21, 04:50 UTC1h 25m
2026-07-21 SWA1305 ATL → MKE Jul 21, 03:20 UTCJul 21, 04:51 UTC1h 31m
2026-07-20 SWA1795 RSW → BDL Jul 20, 23:05 UTCJul 21, 02:20 UTC3h 14m
2026-07-20 SWA1922 - Jul 20, 19:00 UTCJul 20, 19:55 UTC55m
2026-07-20 SWA627 - Jul 20, 15:05 UTCJul 20, 16:05 UTC1h 0m
2026-07-20 SWA627 AUS → SJD Jul 20, 15:02 UTCJul 20, 17:01 UTC1h 59m
2026-07-20 SWA1265 DAL → AUS Jul 20, 12:40 UTCJul 20, 13:15 UTC35m
2026-07-20 SWA1265 DAL → AUS Jul 20, 12:39 UTCJul 20, 13:13 UTC34m
2026-07-20 SWA4814 MIA → DEN Jul 20, 10:45 UTCJul 20, 11:25 UTC40m
2026-07-20 SWA4814 MIA → DEN Jul 20, 10:42 UTCJul 20, 11:22 UTC40m
2026-07-20 SWA3332 - Jul 20, 05:05 UTCJul 20, 06:20 UTC1h 15m
2026-07-20 SWA2340 DEN → PHX Jul 20, 00:40 UTCJul 20, 01:45 UTC1h 5m
2026-07-19 SWA2340 DEN → PHX Jul 19, 19:45 UTCJul 19, 23:30 UTC3h 45m
2026-07-19 SWA2340 SLC → PHX Jul 19, 17:15 UTCJul 19, 18:30 UTC1h 15m
2026-07-19 SWA3250 - Jul 19, 13:15 UTCJul 19, 15:50 UTC2h 35m
2026-07-19 SWA3250 HOU → SLC Jul 19, 13:12 UTCJul 19, 15:45 UTC2h 33m
2026-07-18 SWA37 DAL → HOU Jul 18, 22:45 UTCJul 18, 23:25 UTC40m
2026-07-18 SWA37 DAL → HOU Jul 18, 18:20 UTCJul 18, 20:25 UTC2h 5m

About Mode-S

A Mode-S transponder code (also called an "ICAO 24-bit address" or "hex code") is a 6-character hexadecimal identifier permanently assigned to an aircraft when it's first registered. Unlike callsigns (which change with each flight) or registrations (which can change if an aircraft is sold internationally), the Mode-S address stays with the airframe for the life of the aircraft in that country.

Every ADS-B transmission from an aircraft includes its Mode-S address, making it the most reliable way to identify a specific airframe. Flight-tracking services like Apparatus use the Mode-S address as the primary key for tying position broadcasts, callsigns, and ownership records together.

Prefer a tail-number view? See the N283WN page for operator, model, and routing details .

Mode-S A2DB21 frequently asked

What is Mode-S code A2DB21?
A2DB21 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N283WN.
Where is Mode-S A2DB21 registered?
Mode-S code A2DB21 is allocated to United States (US). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is A2DB21 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A2DB21, octal 50555441, decimal 10,672,929.
What flights does A2DB21 operate?
Mode-S A2DB21 has broadcast 20 distinct callsigns, including SWA2407, SWA3123, SWA1982, SWA556, SWA4228.